Motorola ASTRO Digital Spectra Plus Detailed Service Manual page 13

Table of Contents
02/88, DSP External SRAM Failure U414 .............................................................................5-11
02/84, DSP External SRAM Failure U403 .............................................................................5-11
02/82, DSP External SRAM Failure U402 .............................................................................5-12
02/90, General DSP Hardware Failure ..................................................................................5-12
09/10, Secure Hardware Failure ............................................................................................5-13
09/90, Secure Hardware Failure ............................................................................................5-13
No RX Audio ..........................................................................................................................5-14
No TX Modulation ..................................................................................................................5-15
Key Load Fail .........................................................................................................................5-16
800 MHz Receiver Front-End Hybrid .....................................................................................5-17
UHF Receiver Front-End Hybrid ............................................................................................5-17
VHF Receiver Front-End Hybrid ............................................................................................5-18
ASTRO Spectra Plus VOCON Power-Up Failure ..................................................................5-19
ASTRO Spectra Plus VOCON DC Supply Failure .................................................................5-20
ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 1 of 4 ......................................5-21
ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 2 of 4.......................................5-22
ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 3 of 4 ......................................5-23
ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 4 of 4.......................................5-24
ASTRO Spectra Plus VOCON RX Audio Failure...................................................................5-24
ASTRO Spectra Plus VOCON Secure Hardware Failure ......................................................5-25
ASTRO Spectra Plus VOCON Key Load Fail ........................................................................5-26
Chapter 6 Troubleshooting Waveforms ..............................................6-1
6.1 Introduction.....................................................................................................................................6-1
6.2 ASTRO Digital Spectra Waveforms ...............................................................................................6-2
Waveform W1: Power-On Reset Timing ........................................................................................6-2
Waveform W2: DSP SSI Port RX Mode.........................................................................................6-2
Waveform W3: DSP SSI Port TX Mode CSQ ................................................................................6-3
Waveform W4: ABACUS Programming at Mode Change..............................................................6-3
Waveform W5: ABACUS/ADSIC Interface.....................................................................................6-4
Waveform W6: SPI Bus Programming ADSIC ...............................................................................6-4
Waveform W7: Receive Audio .......................................................................................................6-5
Waveform W8: Transmit Audio ......................................................................................................6-5
Waveform W9: Power-Down Reset................................................................................................6-6
Waveform W10: ADSIC 2.4 MHz Reference..................................................................................6-6
6.3 ASTRO Digital Spectra Plus VOCON Board Waveforms...............................................................6-7
32 kHz Clock Waveform.................................................................................................................6-7
16.8 MHz Clock Waveform.............................................................................................................6-8
TX Modulation Out Waveform ........................................................................................................6-8
Differential ADDAG Output Waveform ...........................................................................................6-9
TX SSI Waveform...........................................................................................................................6-9
SPI Bus Waveform .......................................................................................................................6-10
TX 1 kHz Tone Waveform ............................................................................................................6-10
Serial Audio Port Waveform .........................................................................................................6-11
RX Audio Waveform.....................................................................................................................6-11
RX BBP Waveform.......................................................................................................................6-12
Secure Interface Waveform..........................................................................................................6-12
8 kHz Frame Sync for Security Circuitry Waveform .....................................................................6-13
6881076C25-E
xi
September 5, 2008